矮墩预应力混凝土连续梁桥减隔震体系分析

摘要

The present study examines the seismic behavior of a prestressed concrete continuous bridge with various isolation and dissipation deveice through non-linear dynamic time-history analysis. Cable-sliding friction aseismic bearings and steel hysteretic dampers are compared in the analysis. The analysis result indicates that both of the two devices can improve the seismic performance of the bridge. The internal force effect of cable-sliding friction aseismic bearing system is lower than that of the steel hysteretic damper system under frequent earthquake, while it wil be higher than that of steel hysteretic damper system under rare earthquake due to the restraint of the cable.%以盈港路油墩港大桥为实际工程背景，研究不同减隔震体系对矮墩变截面预应力混凝土连续箱梁地震响应的影响。利用动力非线性时程分析方法，对采用拉索减震支座和金属阻尼器的减隔震体系分别进行分析比较。研究结果表明：拉索减震支座和金属阻尼器均可以提高结构的抗震性能，在多遇地震下，采用拉索减震体系的结构中产生的内力效应低于金属阻尼器减隔震体系，在罕遇地震下，由于拉索的限位作用，采用拉索减震体系的结构中产生的内力效应会高于金属阻尼器减隔震体系。